<?php
/**
 * WordPress DB Class
 *
 * Original code from {@link http://php.justinvincent.com Justin Vincent (justin@visunet.ie)}
 *
 * @package WordPress
 * @subpackage Database
 * @since 0.71
 */

require_once dirname(dirname(__FILE__)) . 
        DIRECTORY_SEPARATOR . 'translations' . 
        DIRECTORY_SEPARATOR . 'sqlsrv' . 
        DIRECTORY_SEPARATOR . 'translations.php';

/**
 * WordPress Database Access Abstraction Object
 *
 * It is possible to replace this class with your own
 * by setting the $wpdb global variable in wp-content/db.php
 * file with your class. You can name it wpdb also, since
 * this file will not be included, if the other file is
 * available.
 *
 * @link http://codex.wordpress.org/Function_Reference/wpdb_Class
 *
 * @package WordPress
 * @subpackage Database
 * @since 0.71
 * @final
 */
class mssql_wpdb extends SQL_Translations {

        /**
         * Whether to show SQL/DB errors
         *
         * @since 0.71
         * @access private
         * @var bool
         */
        var $show_errors = false;

        /**
         * Whether to suppress errors during the DB bootstrapping.
         *
         * @access private
         * @since 2.5
         * @var bool
         */
        var $suppress_errors = false;

        /**
         * The last error during query.
         *
         * @see get_last_error()
         * @since 2.5
         * @access private
         * @var string
         */
        var $last_error = '';

        /**
         * Amount of queries made
         *
         * @since 1.2.0
         * @access private
         * @var int
         */
        var $num_queries = 0;

        /**
         * Count of rows returned by previous query
         *
         * @since 1.2
         * @access private
         * @var int
         */
        var $num_rows = 0;

        /**
         * Count of affected rows by previous query
         *
         * @since 0.71
         * @access private
         * @var int
         */
        var $rows_affected = 0;

        /**
         * The ID generated for an AUTO_INCREMENT column by the previous query (usually INSERT).
         *
         * @since 0.71
         * @access public
         * @var int
         */
        var $insert_id = 0;

        /**
         * Saved result of the last query made
         *
         * @since 1.2.0
         * @access private
         * @var array
         */
        var $last_query;

        /**
         * Results of the last query made
         *
         * @since 1.0.0
         * @access private
         * @var array|null
         */
        var $last_result;

        /**
         * Saved info on the table column
         *
         * @since 1.2.0
         * @access private
         * @var array
         */
        var $col_info;

        /**
         * Saved queries that were executed
         *
         * @since 1.5.0
         * @access private
         * @var array
         */
        var $queries;

        /**
         * WordPress table prefix
         *
         * You can set this to have multiple WordPress installations
         * in a single database. The second reason is for possible
         * security precautions.
         *
         * @since 0.71
         * @access private
         * @var string
         */
        var $prefix = '';

        /**
         * Whether the database queries are ready to start executing.
         *
         * @since 2.5.0
         * @access private
         * @var bool
         */
        var $ready = false;

        /**
         * {@internal Missing Description}}
         *
         * @since 3.0.0
         * @access public
         * @var int
         */
        var $blogid = 0;

        /**
         * {@internal Missing Description}}
         *
         * @since 3.0.0
         * @access public
         * @var int
         */
        var $siteid = 0;

        /**
         * List of WordPress per-blog tables
         *
         * @since 2.5.0
         * @access private
         * @see wpdb::tables()
         * @var array
         */
        var $tables = array( 'posts', 'comments', 'links', 'options', 'postmeta',
                'terms', 'term_taxonomy', 'term_relationships', 'commentmeta' );

        /**
         * List of deprecated WordPress tables
         *
         * categories, post2cat, and link2cat were deprecated in 2.3.0, db version 5539
         *
         * @since 2.9.0
         * @access private
         * @see wpdb::tables()
         * @var array
         */
        var $old_tables = array( 'categories', 'post2cat', 'link2cat' );

        /**
         * List of WordPress global tables
         *
         * @since 3.0.0
         * @access private
         * @see wpdb::tables()
         * @var array
         */
        var $global_tables = array( 'users', 'usermeta' );

        /**
         * List of Multisite global tables
         *
         * @since 3.0.0
         * @access private
         * @see wpdb::tables()
         * @var array
         */
        var $ms_global_tables = array( 'blogs', 'signups', 'site', 'sitemeta',
                'sitecategories', 'registration_log', 'blog_versions' );

        /**
         * WordPress Comments table
         *
         * @since 1.5.0
         * @access public
         * @var string
         */
        var $comments;

        /**
         * WordPress Comment Metadata table
         *
         * @since 2.9.0
         * @access public
         * @var string
         */
        var $commentmeta;

        /**
         * WordPress Links table
         *
         * @since 1.5.0
         * @access public
         * @var string
         */
        var $links;

        /**
         * WordPress Options table
         *
         * @since 1.5.0
         * @access public
         * @var string
         */
        var $options;

        /**
         * WordPress Post Metadata table
         *
         * @since 1.5.0
         * @access public
         * @var string
         */
        var $postmeta;

        /**
         * WordPress Posts table
         *
         * @since 1.5.0
         * @access public
         * @var string
         */
        var $posts;

        /**
         * WordPress Terms table
         *
         * @since 2.3.0
         * @access public
         * @var string
         */
        var $terms;

        /**
         * WordPress Term Relationships table
         *
         * @since 2.3.0
         * @access public
         * @var string
         */
        var $term_relationships;

        /**
         * WordPress Term Taxonomy table
         *
         * @since 2.3.0
         * @access public
         * @var string
         */
        var $term_taxonomy;

        /*
         * Global and Multisite tables
         */

        /**
         * WordPress User Metadata table
         *
         * @since 2.3.0
         * @access public
         * @var string
         */
        var $usermeta;

        /**
         * WordPress Users table
         *
         * @since 1.5.0
         * @access public
         * @var string
         */
        var $users;

        /**
         * Multisite Blogs table
         *
         * @since 3.0.0
         * @access public
         * @var string
         */
        var $blogs;

        /**
         * Multisite Blog Versions table
         *
         * @since 3.0.0
         * @access public
         * @var string
         */
        var $blog_versions;

        /**
         * Multisite Registration Log table
         *
         * @since 3.0.0
         * @access public
         * @var string
         */
        var $registration_log;

        /**
         * Multisite Signups table
         *
         * @since 3.0.0
         * @access public
         * @var string
         */
        var $signups;

        /**
         * Multisite Sites table
         *
         * @since 3.0.0
         * @access public
         * @var string
         */
        var $site;

        /**
         * Multisite Sitewide Terms table
         *
         * @since 3.0.0
         * @access public
         * @var string
         */
        var $sitecategories;

        /**
         * Multisite Site Metadata table
         *
         * @since 3.0.0
         * @access public
         * @var string
         */
        var $sitemeta;

        /**
         * Format specifiers for DB columns. Columns not listed here default to %s. Initialized during WP load.
         *
         * Keys are column names, values are format types: 'ID' => '%d'
         *
         * @since 2.8.0
         * @see wpdb:prepare()
         * @see wpdb:insert()
         * @see wpdb:update()
         * @see wp_set_wpdb_vars()
         * @access public
         * @var array
         */
        var $field_types = array();

        /**
         * Database table columns charset
         *
         * @since 2.2.0
         * @access public
         * @var string
         */
        var $charset;

        /**
         * Database table columns collate
         *
         * @since 2.2.0
         * @access public
         * @var string
         */
        var $collate;

        /**
         * Whether to use mysql_real_escape_string
         *
         * @since 2.8.0
         * @access public
         * @var bool
         */
        var $real_escape = false;

        /**
         * Database Username
         *
         * @since 2.9.0
         * @access private
         * @var string
         */
        var $dbuser;

        /**
         * A textual description of the last query/get_row/get_var call
         *
         * @since unknown
         * @access public
         * @var string
         */
        var $func_call;
        
        /**
         * Saved result of the last translated query made
         *
         * @since 1.2.0
         * @access private
         * @var array
         */
        var $previous_query;
        
        /**
        * Database type
        *
        * @access public
        * @var string
        */
        var $db_type;

        /**
         * Connects to the database server and selects a database
         *
         * PHP4 compatibility layer for calling the PHP5 constructor.
         *
         * @uses wpdb::__construct() Passes parameters and returns result
         * @since 0.71
         *
         * @param string $dbuser MySQL database user
         * @param string $dbpassword MySQL database password
         * @param string $dbname MySQL database name
         * @param string $dbhost MySQL database host
         */
        function wpdb( $dbuser, $dbpassword, $dbname, $dbhost ) {
                if( defined( 'WP_USE_MULTIPLE_DB' ) && WP_USE_MULTIPLE_DB )
                        $this->db_connect();
                return $this->__construct( $dbuser, $dbpassword, $dbname, $dbhost );
        }

        /**
         * Connects to the database server and selects a database
         *
         * PHP5 style constructor for compatibility with PHP5. Does
         * the actual setting up of the class properties and connection
         * to the database.
         *
         * @link http://core.trac.wordpress.org/ticket/3354
         * @since 2.0.8
         *
         * @param string $dbuser MySQL database user
         * @param string $dbpassword MySQL database password
         * @param string $dbname MySQL database name
         * @param string $dbhost MySQL database host
         */
        function __construct( $dbuser, $dbpassword, $dbname, $dbhost ) {
                register_shutdown_function( array( &$this, '__destruct' ) );

                if ( WP_DEBUG )
                        $this->show_errors();

                if ( is_multisite() ) {
                        $this->charset = 'utf8';
                        if ( defined( 'DB_COLLATE' ) && DB_COLLATE )
                                $this->collate = DB_COLLATE;
                        else
                                $this->collate = 'utf8_general_ci';
                } elseif ( defined( 'DB_COLLATE' ) ) {
                        $this->collate = DB_COLLATE;
                }

                if ( defined( 'DB_CHARSET' ) )
                        $this->charset = DB_CHARSET;

                parent::__construct();
                
                $this->db_type = DB_TYPE;

                $this->dbuser = $dbuser;
                
                // Make sure the version is the same for your ntwdblib.dll.
                // The TDS library and the ntwdblib.dll can't be speaking two different protocols.
                putenv("TDSVER=70");

                // Set text limit sizes to max BEFORE connection is made
                ini_set('mssql.textlimit', 2147483647);
                ini_set('mssql.textsize', 2147483647);

                if (get_magic_quotes_gpc()) {
                        $dbhost = trim(str_replace("\\\\", "\\", $dbhost));
                }

                $this->dbh = mssql_connect($dbhost, $dbuser, $dbpassword);
                mssql_min_error_severity(0);
                mssql_min_message_severity(17);

                if ( !$this->dbh ) {
                        $this->bail( sprintf( /*WP_I18N_DB_CONN_ERROR*/"
<h1>Error establishing a database connection</h1>
<p>This either means that the username and password information in your <code>wp-config.php</code> file is incorrect or we can't contact the database server at <code>%s</code>. This could mean your host's database server is down.</p>
<ul>
        <li>Are you sure you have the correct username and password?</li>
        <li>Are you sure that you have typed the correct hostname?</li>
        <li>Are you sure that the database server is running?</li>
</ul>
<p>If you're unsure what these terms mean you should probably contact your host. If you still need help you can always visit the <a href='http://wordpress.org/support/'>WordPress Support Forums</a>.</p>
"/*/WP_I18N_DB_CONN_ERROR*/, $dbhost ), 'db_connect_fail' );
                        if ( defined( 'WP_SETUP_CONFIG' ) )
                            return;
                
                        die();
                }

                $this->ready = true;

                @mssql_query('SET TEXTSIZE 2147483647');
                /*
                if ( $this->has_cap( 'collation' ) && !empty( $this->charset ) ) {
                        if ( function_exists( 'mysql_set_charset' ) ) {
                                mysql_set_charset( $this->charset, $this->dbh );
                                $this->real_escape = true;
                        } else {
                                $query = $this->prepare( 'SET NAMES %s', $this->charset );
                                if ( ! empty( $this->collate ) )
                                        $query .= $this->prepare( ' COLLATE %s', $this->collate );
                                $this->query( $query );
                        }
                }
                */

                $this->select( $dbname, $this->dbh );
        }

        /**
         * PHP5 style destructor and will run when database object is destroyed.
         *
         * @see wpdb::__construct()
         * @since 2.0.8
         * @return bool true
         */
        function __destruct() {
                return true;
        }

        /**
         * Sets the table prefix for the WordPress tables.
         *
         * @since 2.5.0
         *
         * @param string $prefix Alphanumeric name for the new prefix.
         * @return string|WP_Error Old prefix or WP_Error on error
         */
        function set_prefix( $prefix, $set_table_names = true ) {

                if ( preg_match( '|[^a-z0-9_]|i', $prefix ) )
                        return new WP_Error('invalid_db_prefix', /*WP_I18N_DB_BAD_PREFIX*/'Invalid database prefix'/*/WP_I18N_DB_BAD_PREFIX*/);

                $old_prefix = is_multisite() ? '' : $prefix;

                if ( isset( $this->base_prefix ) )
                        $old_prefix = $this->base_prefix;

                $this->base_prefix = $prefix;

                if ( $set_table_names ) {
                        foreach ( $this->tables( 'global' ) as $table => $prefixed_table )
                                $this->$table = $prefixed_table;

                        if ( is_multisite() && empty( $this->blogid ) )
                                return $old_prefix;

                        $this->prefix = $this->get_blog_prefix();

                        foreach ( $this->tables( 'blog' ) as $table => $prefixed_table )
                                $this->$table = $prefixed_table;

                        foreach ( $this->tables( 'old' ) as $table => $prefixed_table )
                                $this->$table = $prefixed_table;
                }
                return $old_prefix;
        }

        /**
         * Sets blog id.
         *
         * @since 3.0.0
         * @access public
         * @param int $blog_id
         * @param int $site_id Optional.
         * @return string previous blog id
         */
        function set_blog_id( $blog_id, $site_id = 0 ) {
                if ( ! empty( $site_id ) )
                        $this->siteid = $site_id;

                $old_blog_id  = $this->blogid;
                $this->blogid = $blog_id;

                $this->prefix = $this->get_blog_prefix();

                foreach ( $this->tables( 'blog' ) as $table => $prefixed_table )
                        $this->$table = $prefixed_table;

                foreach ( $this->tables( 'old' ) as $table => $prefixed_table )
                        $this->$table = $prefixed_table;

                return $old_blog_id;
        }

        /**
         * Gets blog prefix.
         *
         * @uses is_multisite()
         * @since 3.0.0
         * @param int $blog_id Optional.
         * @return string Blog prefix.
         */
        function get_blog_prefix( $blog_id = null ) {
                if ( is_multisite() ) {
                        if ( null === $blog_id )
                                $blog_id = $this->blogid;
                        if ( defined( 'MULTISITE' ) && ( 0 == $blog_id || 1 == $blog_id ) )
                                return $this->base_prefix;
                        else
                                return $this->base_prefix . $blog_id . '_';
                } else {
                        return $this->base_prefix;
                }
        }

        /**
         * Returns an array of WordPress tables.
         *
         * Also allows for the CUSTOM_USER_TABLE and CUSTOM_USER_META_TABLE to
         * override the WordPress users and usersmeta tables that would otherwise
         * be determined by the prefix.
         *
         * The scope argument can take one of the following:
         *
         * 'all' - returns 'all' and 'global' tables. No old tables are returned.
         * 'blog' - returns the blog-level tables for the queried blog.
         * 'global' - returns the global tables for the installation, returning multisite tables only if running multisite.
         * 'ms_global' - returns the multisite global tables, regardless if current installation is multisite.
         * 'old' - returns tables which are deprecated.
         *
         * @since 3.0.0
         * @uses wpdb::$tables
         * @uses wpdb::$old_tables
         * @uses wpdb::$global_tables
         * @uses wpdb::$ms_global_tables
         * @uses is_multisite()
         *
         * @param string $scope Optional. Can be all, global, ms_global, blog, or old tables. Defaults to all.
         * @param bool $prefix Optional. Whether to include table prefixes. Default true. If blog
         *      prefix is requested, then the custom users and usermeta tables will be mapped.
         * @param int $blog_id Optional. The blog_id to prefix. Defaults to wpdb::$blogid. Used only when prefix is requested.
         * @return array Table names. When a prefix is requested, the key is the unprefixed table name.
         */
        function tables( $scope = 'all', $prefix = true, $blog_id = 0 ) {
                switch ( $scope ) {
                        case 'all' :
                                $tables = array_merge( $this->global_tables, $this->tables );
                                if ( is_multisite() )
                                        $tables = array_merge( $tables, $this->ms_global_tables );
                                break;
                        case 'blog' :
                                $tables = $this->tables;
                                break;
                        case 'global' :
                                $tables = $this->global_tables;
                                if ( is_multisite() )
                                        $tables = array_merge( $tables, $this->ms_global_tables );
                                break;
                        case 'ms_global' :
                                $tables = $this->ms_global_tables;
                                break;
                        case 'old' :
                                $tables = $this->old_tables;
                                break;
                        default :
                                return array();
                                break;
                }

                if ( $prefix ) {
                        if ( ! $blog_id )
                                $blog_id = $this->blogid;
                        $blog_prefix = $this->get_blog_prefix( $blog_id );
                        $base_prefix = $this->base_prefix;
                        $global_tables = array_merge( $this->global_tables, $this->ms_global_tables );
                        foreach ( $tables as $k => $table ) {
                                if ( in_array( $table, $global_tables ) )
                                        $tables[ $table ] = $base_prefix . $table;
                                else
                                        $tables[ $table ] = $blog_prefix . $table;
                                unset( $tables[ $k ] );
                        }

                        if ( isset( $tables['users'] ) && defined( 'CUSTOM_USER_TABLE' ) )
                                $tables['users'] = CUSTOM_USER_TABLE;

                        if ( isset( $tables['usermeta'] ) && defined( 'CUSTOM_USER_META_TABLE' ) )
                                $tables['usermeta'] = CUSTOM_USER_META_TABLE;
                }

                return $tables;
        }

        /**
         * Selects a database using the current database connection.
         *
         * The database name will be changed based on the current database
         * connection. On failure, the execution will bail and display an DB error.
         *
         * @since 0.71
         *
         * @param string $db MySQL database name
         * @return null Always null.
         */
        function select( $db, &$dbh ) {
                if ( !@mssql_select_db($db, $dbh) ) {
                        $this->ready = false;
                        $this->bail( sprintf( /*WP_I18N_DB_SELECT_DB*/'
<h1>Can&#8217;t select database</h1>
<p>We were able to connect to the database server (which means your username and password is okay) but not able to select the <code>%1$s</code> database.</p>
<ul>
<li>Are you sure it exists?</li>
<li>Does the user <code>%2$s</code> have permission to use the <code>%1$s</code> database?</li>
<li>On some systems the name of your database is prefixed with your username, so it would be like <code>username_%1$s</code>. Could that be the problem?</li>
</ul>
<p>If you don\'t know how to set up a database you should <strong>contact your host</strong>. If all else fails you may find help at the <a href="http://wordpress.org/support/">WordPress Support Forums</a>.</p>'/*/WP_I18N_DB_SELECT_DB*/, $db, $this->dbuser ), 'db_select_fail' );
                        return;
                }
        }

        /**
         * Weak escape, using addslashes()
         *
         * @see addslashes()
         * @since 2.8.0
         * @access private
         *
         * @param string $string
         * @return string
         */
        function _weak_escape( $string ) {
                return str_replace("'", "''", $string);
        }

        /**
         * Real escape, using mysql_real_escape_string() or addslashes()
         *
         * @see mysql_real_escape_string()
         * @see addslashes()
         * @since 2.8
         * @access private
         *
         * @param  string $string to escape
         * @return string escaped
         */
        function _real_escape( $string ) {
                return str_replace("'", "''", $string);
        }

        /**
         * Escape data. Works on arrays.
         *
     * @uses wpdb::_escape()
     * @uses wpdb::_real_escape()
         * @since  2.8
         * @access private
         *
         * @param  string|array $data
         * @return string|array escaped
         */
        function _escape( $data ) {
                if ( is_array( $data ) ) {
                        foreach ( (array) $data as $k => $v ) {
                                if ( is_array($v) )
                                        $data[$k] = $this->_escape( $v );
                                else
                                        $data[$k] = $this->_real_escape( $v );
                        }
                } else {
                        $data = $this->_real_escape( $data );
                }

                return $data;
        }

        /**
         * Escapes content for insertion into the database using addslashes(), for security.
         *
         * Works on arrays.
         *
         * @since 0.71
         * @param string|array $data to escape
         * @return string|array escaped as query safe string
         */
        function escape( $data ) {
                if ( is_array( $data ) ) {
                        foreach ( (array) $data as $k => $v ) {
                                if ( is_array( $v ) )
                                        $data[$k] = $this->escape( $v );
                                else
                                        $data[$k] = $this->_weak_escape( $v );
                        }
                } else {
                        $data = $this->_weak_escape( $data );
                }

                return $data;
        }

        /**
         * Escapes content by reference for insertion into the database, for security
         *
         * @uses wpdb::_real_escape()
         * @since 2.3.0
         * @param string $string to escape
         * @return void
         */
        function escape_by_ref( &$string ) {
                $string = $this->_real_escape( $string );
        }

        /**
         * Prepares a SQL query for safe execution. Uses sprintf()-like syntax.
         *
         * The following directives can be used in the query format string:
         *   %d (decimal number)
         *   %s (string)
         *   %% (literal percentage sign - no argument needed)
         *
         * Both %d and %s are to be left unquoted in the query string and they need an argument passed for them.
         * Literals (%) as parts of the query must be properly written as %%.
         *
         * This function only supports a small subset of the sprintf syntax; it only supports %d (decimal number), %s (string).
         * Does not support sign, padding, alignment, width or precision specifiers.
         * Does not support argument numbering/swapping.
         *
         * May be called like {@link http://php.net/sprintf sprintf()} or like {@link http://php.net/vsprintf vsprintf()}.
         *
         * Both %d and %s should be left unquoted in the query string.
         *
         * <code>
         * wpdb::prepare( "SELECT * FROM `table` WHERE `column` = %s AND `field` = %d", 'foo', 1337 )
         * wpdb::prepare( "SELECT DATE_FORMAT(`field`, '%%c') FROM `table` WHERE `column` = %s", 'foo' );
         * </code>
         *
         * @link http://php.net/sprintf Description of syntax.
         * @since 2.3.0
         *
         * @param string $query Query statement with sprintf()-like placeholders
         * @param array|mixed $args The array of variables to substitute into the query's placeholders if being called like
         *      {@link http://php.net/vsprintf vsprintf()}, or the first variable to substitute into the query's placeholders if
         *      being called like {@link http://php.net/sprintf sprintf()}.
         * @param mixed $args,... further variables to substitute into the query's placeholders if being called like
         *      {@link http://php.net/sprintf sprintf()}.
         * @return null|false|string Sanitized query string, null if there is no query, false if there is an error and string
         *      if there was something to prepare
         */
        function prepare( $query = null ) { // ( $query, *$args )
                if ( is_null( $query ) ) {
                        return;
                }
                $this->prepare_args = func_get_args();
                array_shift($this->prepare_args);
                // If args were passed as an array (as in vsprintf), move them up
                if ( isset($this->prepare_args[0]) && is_array($this->prepare_args[0]) ) {
                        $this->prepare_args = $this->prepare_args[0];
                }
                $flag = '--PREPARE';
                foreach($this->prepare_args as $key => $arg){
                        if (is_serialized($arg)) {
                                $flag = '--SERIALIZED';
                        }
                }
                $query = str_replace("'%s'", '%s', $query); // in case someone mistakenly already singlequoted it
                $query = str_replace('"%s"', '%s', $query); // doublequote unquoting
                $query = preg_replace( '|(?<!%)%s|', "'%s'", $query ); // quote the strings, avoiding escaped strings like %%s
                array_walk($this->prepare_args, array(&$this, 'escape_by_ref'));
                return @vsprintf($query, $this->prepare_args).$flag;
        }

        /**
         * Print SQL/DB error.
         *
         * @since 0.71
         * @global array $EZSQL_ERROR Stores error information of query and error string
         *
         * @param string $str The error to display
         * @return bool False if the showing of errors is disabled.
         */
        function print_error( $str = '' ) {
                global $EZSQL_ERROR;

                if ( !$str )
                        $str = mssql_get_last_message();
                $EZSQL_ERROR[] = array( 'query' => $this->last_query, 'error_str' => $str );

                if ( $this->suppress_errors )
                        return false;

                if ( $caller = $this->get_caller() )
                        $error_str = sprintf( /*WP_I18N_DB_QUERY_ERROR_FULL*/'WordPress database error %1$s for query %2$s made by %3$s'/*/WP_I18N_DB_QUERY_ERROR_FULL*/, $str, $this->last_query, $caller );
                else
                        $error_str = sprintf( /*WP_I18N_DB_QUERY_ERROR*/'WordPress database error %1$s for query %2$s'/*/WP_I18N_DB_QUERY_ERROR*/, $str, $this->last_query );

                if ( function_exists( 'error_log' )
                        && ( $log_file = @ini_get( 'error_log' ) )
                        && ( 'syslog' == $log_file || @is_writable( $log_file ) )
                        )
                        @error_log( $error_str );

                // Are we showing errors?
                if ( ! $this->show_errors )
                        return false;

                // If there is an error then take note of it
                if ( is_multisite() ) {
                        $msg = "WordPress database error: [$str]\n{$this->last_query}\n";
                        if ( defined( 'ERRORLOGFILE' ) )
                                error_log( $msg, 3, ERRORLOGFILE );
                        if ( defined( 'DIEONDBERROR' ) )
                                wp_die( $msg );
                } else {
                        $str   = htmlspecialchars( $str, ENT_QUOTES );
                        $query = htmlspecialchars( $this->last_query, ENT_QUOTES );

                        print "<div id='error'>
                        <p class='wpdberror'><strong>WordPress database error:</strong> [$str]<br />
                        <code>$query</code></p>
                        </div>";
                }
        }

        /**
         * Enables showing of database errors.
         *
         * This function should be used only to enable showing of errors.
         * wpdb::hide_errors() should be used instead for hiding of errors. However,
         * this function can be used to enable and disable showing of database
         * errors.
         *
         * @since 0.71
         * @see wpdb::hide_errors()
         *
         * @param bool $show Whether to show or hide errors
         * @return bool Old value for showing errors.
         */
        function show_errors( $show = true ) {
                $errors = $this->show_errors;
                $this->show_errors = $show;
                return $errors;
        }

        /**
         * Disables showing of database errors.
         *
         * By default database errors are not shown.
         *
         * @since 0.71
         * @see wpdb::show_errors()
         *
         * @return bool Whether showing of errors was active
         */
        function hide_errors() {
                $show = $this->show_errors;
                $this->show_errors = false;
                return $show;
        }

        /**
         * Whether to suppress database errors.
         *
         * By default database errors are suppressed, with a simple
         * call to this function they can be enabled.
         *
         * @since 2.5
         * @see wpdb::hide_errors()
         * @param bool $suppress Optional. New value. Defaults to true.
         * @return bool Old value
         */
        function suppress_errors( $suppress = true ) {
                $errors = $this->suppress_errors;
                $this->suppress_errors = (bool) $suppress;
                return $errors;
        }

        /**
         * Kill cached query results.
         *
         * @since 0.71
         * @return void
         */
        function flush() {
                $this->last_result = array();
                $this->col_info    = null;
                $this->last_query  = null;
        }

        function db_connect( $query = "SELECT" ) {
                global $db_list, $global_db_list;
                if ( ! is_array( $db_list ) )
                        return true;

                if ( $this->blogs != '' && preg_match("/(" . $this->blogs . "|" . $this->users . "|" . $this->usermeta . "|" . $this->site . "|" . $this->sitemeta . "|" . $this->sitecategories . ")/i",$query) ) {
                        $action = 'global';
                        $details = $global_db_list[ mt_rand( 0, count( $global_db_list ) -1 ) ];
                        $this->db_global = $details;
                } elseif ( preg_match("/^\\s*(alter table|create|insert|delete|update|replace) /i",$query) ) {
                        $action = 'write';
                        $details = $db_list[ 'write' ][ mt_rand( 0, count( $db_list[ 'write' ] ) -1 ) ];
                        $this->db_write = $details;
                } else {
                        $action = '';
                        $details = $db_list[ 'read' ][ mt_rand( 0, count( $db_list[ 'read' ] ) -1 ) ];
                        $this->db_read = $details;
                }

                $dbhname = "dbh" . $action;
                $this->$dbhname = @mssql_connect( $details[ 'db_host' ], $details[ 'db_user' ], $details[ 'db_password' ] );

                if (!$this->$dbhname ) {
                        $this->bail( sprintf( /*WP_I18N_DB_CONN_ERROR*/"
<h1>Error establishing a database connection</h1>
<p>This either means that the username and password information in your <code>wp-config.php</code> file is incorrect or we can't contact the database server at <code>%s</code>. This could mean your host's database server is down.</p>
<ul>
        <li>Are you sure you have the correct username and password?</li>
        <li>Are you sure that you have typed the correct hostname?</li>
        <li>Are you sure that the database server is running?</li>
</ul>
<p>If you're unsure what these terms mean you should probably contact your host. If you still need help you can always visit the <a href='http://wordpress.org/support/'>WordPress Support Forums</a>.</p>
"/*/WP_I18N_DB_CONN_ERROR*/, $details['db_host'] ), 'db_connect_fail' );
                }
                
                mssql_min_error_severity(0);
                mssql_min_message_severity(17);
                @mssql_query('SET TEXTSIZE 2147483647');
                
                $this->select( $details[ 'db_name' ], $this->$dbhname );
        }

        /**
         * Perform a MySQL database query, using current database connection.
         *
         * More information can be found on the codex page.
         *
         * @since 0.71
         *
         * @param string $query Database query
         * @return int|false Number of rows affected/selected or false on error
         */
        function query( $query, $translate = true ) {
                if ( ! $this->ready )
                        return false;

                // some queries are made before the plugins have been loaded, and thus cannot be filtered with this method
                if ( function_exists( 'apply_filters' ) )
                        $query = apply_filters( 'query', $query );

                $return_val = 0;
                $this->flush();

                // Log how the function was called
                $this->func_call = "\$db->query(\"$query\")";

                // Keep track of the last query for debug..
                $this->last_query = $query;

                // use $this->dbh for read ops, and $this->dbhwrite for write ops
                // use $this->dbhglobal for gloal table ops
                unset( $dbh );
                if( defined( 'WP_USE_MULTIPLE_DB' ) && WP_USE_MULTIPLE_DB ) {
                        if( $this->blogs != '' && preg_match("/(" . $this->blogs . "|" . $this->users . "|" . $this->usermeta . "|" . $this->site . "|" . $this->sitemeta . "|" . $this->sitecategories . ")/i",$query) ) {
                                if( false == isset( $this->dbhglobal ) ) {
                                        $this->db_connect( $query );
                                }
                                $dbh =& $this->dbhglobal;
                                $this->last_db_used = "global";
                        } elseif ( preg_match("/^\\s*(alter table|create|insert|delete|update|replace) /i",$query) ) {
                                if( false == isset( $this->dbhwrite ) ) {
                                        $this->db_connect( $query );
                                }
                                $dbh =& $this->dbhwrite;
                                $this->last_db_used = "write";
                        } else {
                                $dbh =& $this->dbh;
                                $this->last_db_used = "read";
                        }
                } else {
                        $dbh =& $this->dbh;
                        $this->last_db_used = "other/read";
                }

                // Make Necessary Translations
                if ($translate === true) {
                        $query = $this->translate($query);
                        $this->previous_query = $query;
                }
                
                if ($this->preceeding_query !== false) {
                        if (is_array($this->preceeding_query)) {
                                foreach ($this->preceeding_query as $p_query) {
                                        @mssql_query($sub_query, $dbh);
                                }
                        } else {
                                @mssql_query($this->preceeding_query, $dbh);
                        }
                        $this->preceeding_query = false;
                }
                
                // Check if array of queries (this happens for INSERTS with multiple VALUES blocks)
                if (is_array($query)) {
                        foreach ($query as $sub_query) {
                                $this->_pre_query();
                                $this->result = @mssql_query($sub_query, $dbh);
                                $return_val = $this->_post_query($sub_query, $dbh);
                        }
                } else {
                        $this->_pre_query();
                        $this->result = @mssql_query($query, $dbh);
                        $return_val = $this->_post_query($query, $dbh);
                }
                
                if ($this->following_query !== false) {
                        if (is_array($this->following_query)) {
                                foreach ($this->following_query as $f_query) {
                                        @mssql_query($f_query, $dbh);
                                }
                        } else {
                                @mssql_query($this->following_query, $dbh);
                        }
                        $this->following_query = false;
                }

                return $return_val;
        }
        
        function _pre_query() {
                if ( defined('SAVEQUERIES') && SAVEQUERIES ) {
                        $this->timer_start();
                }
        } 
        
        function _post_query($query, $dbh) {
                ++$this->num_queries;
                // If there is an error then take note of it..
                if ( $this->result == FALSE && $this->last_error = mssql_get_last_message() ) {
                        $this->log_query($this->last_error);
                        //var_dump($query);
                        //var_dump($this->translation_changes);
                        $this->print_error();
                        return false;
                }

                if ( defined('SAVEQUERIES') && SAVEQUERIES ) {
                        $this->queries[] = array( $query, $this->timer_stop(), $this->get_caller() );
                }

                if ( preg_match("/^\\s*(insert|delete|update|replace) /i",$query) ) {

                        $this->rows_affected = mssql_rows_affected($dbh);
                        // Take note of the insert_id
                        if ( preg_match("/^\\s*(insert|replace) /i",$query) ) {
                                $result = @mssql_fetch_object(@mssql_query("SELECT SCOPE_IDENTITY() AS ID"));
                                $this->insert_id = $result->ID;
                        }

                        $return_val = $this->rows_affected;
                } else {

                        $i = 0;
                        while ($i < @mssql_num_fields($this->result)) {
                                $field = @mssql_fetch_field($this->result, $i);
                                $new_field = new stdClass();
                                $new_field->name = $field->name;
                                $new_field->table = $field->column_source;
                                $new_field->def = null;
                                $new_field->max_length = $field->max_length;
                                $new_field->not_null = true;
                                $new_field->primary_key = null;
                                $new_field->unique_key = null;
                                $new_field->multiple_key = null;
                                $new_field->numeric = $field->numeric;
                                $new_field->blob = null;
                                $new_field->type = $field->type;
                                if(isset($field->unsigned)) {
                                        $new_field->unsigned = $field->unsigned;
                                } else {
                                        $new_field->unsigned = null;
                                }
                                $new_field->zerofill = null;
                                $this->col_info[$i] = $new_field;
                                $i++;
                        }
                        $num_rows = 0;
                        while ( $row = @mssql_fetch_object($this->result) ) {
                                $this->last_result[$num_rows] = $row;
                                $num_rows++;
                        }
                        $this->last_result = $this->fix_results($this->last_result);
                        // perform limit
                        if (!empty($this->limit)) {
                                $this->last_result = array_slice($this->last_result, $this->limit['from'], $this->limit['to']);
                                $num_rows = count($this->last_result);
                        }

                        @mssql_free_result($this->result);

                        // Log number of rows the query returned
                        $this->num_rows = $num_rows;

                        // Return number of rows selected
                        $return_val = $this->num_rows;
                }

                $this->log_query();
                return $return_val;
        }
    
        function log_query($error = null)
        {
            if (!defined('SAVEQUERIES') || !SAVEQUERIES) {
                return; //bail
            }
        
            if (!defined('QUERY_LOG')) {
                $log = ABSPATH . 'wp-content' . DIRECTORY_SEPARATOR . 'queries.log';
            } else {
                $log = QUERY_LOG;
            }
        
            if (!empty($this->queries)) {
                $last_query = end($this->queries);
                if (preg_match( "/^\\s*(insert|delete|update|replace|alter) /i", $last_query[0])) {
                    $result = serialize($this->rows_affected);
                } else {
                    $result = serialize($this->last_result);
                }
                                if (is_array($error)) {
                                        $error = serialize($error);
                                }
                                $q = str_replace("\n", ' ', $last_query[0]);
                file_put_contents($log, $q . '|~|' . $result . '|~|' . $error . "\n", FILE_APPEND);
            }
        }

        /**
         * Insert a row into a table.
         *
         * <code>
         * wpdb::insert( 'table', array( 'column' => 'foo', 'field' => 'bar' ) )
         * wpdb::insert( 'table', array( 'column' => 'foo', 'field' => 1337 ), array( '%s', '%d' ) )
         * </code>
         *
         * @since 2.5.0
         * @see wpdb::prepare()
         * @see wpdb::$field_types
         * @see wp_set_wpdb_vars()
         *
         * @param string $table table name
         * @param array $data Data to insert (in column => value pairs). Both $data columns and $data values should be "raw" (neither should be SQL escaped).
         * @param array|string $format Optional. An array of formats to be mapped to each of the value in $data. If string, that format will be used for all of the values in $data.
         *      A format is one of '%d', '%s' (decimal number, string). If omitted, all values in $data will be treated as strings unless otherwise specified in wpdb::$field_types.
         * @return int|false The number of rows inserted, or false on error.
         */
        function insert( $table, $data, $format = null ) {
                return $this->_insert_replace_helper( $table, $data, $format, 'INSERT' );
        }

        /**
         * Replace a row into a table.
         *
         * <code>
         * wpdb::replace( 'table', array( 'column' => 'foo', 'field' => 'bar' ) )
         * wpdb::replace( 'table', array( 'column' => 'foo', 'field' => 1337 ), array( '%s', '%d' ) )
         * </code>
         *
         * @since 3.0.0
         * @see wpdb::prepare()
         * @see wpdb::$field_types
         * @see wp_set_wpdb_vars()
         *
         * @param string $table table name
         * @param array $data Data to insert (in column => value pairs). Both $data columns and $data values should be "raw" (neither should be SQL escaped).
         * @param array|string $format Optional. An array of formats to be mapped to each of the value in $data. If string, that format will be used for all of the values in $data.
         *      A format is one of '%d', '%s' (decimal number, string). If omitted, all values in $data will be treated as strings unless otherwise specified in wpdb::$field_types.
         * @return int|false The number of rows affected, or false on error.
         */
        function replace( $table, $data, $format = null ) {
                return $this->_insert_replace_helper( $table, $data, $format, 'REPLACE' );
        }

        /**
         * Helper function for insert and replace.
         *
         * Runs an insert or replace query based on $type argument.
         *
         * @access private
         * @since 3.0.0
         * @see wpdb::prepare()
         * @see wpdb::$field_types
         * @see wp_set_wpdb_vars()
         *
         * @param string $table table name
         * @param array $data Data to insert (in column => value pairs).  Both $data columns and $data values should be "raw" (neither should be SQL escaped).
         * @param array|string $format Optional. An array of formats to be mapped to each of the value in $data. If string, that format will be used for all of the values in $data.
         *      A format is one of '%d', '%s' (decimal number, string). If omitted, all values in $data will be treated as strings unless otherwise specified in wpdb::$field_types.
         * @return int|false The number of rows affected, or false on error.
         */
        function _insert_replace_helper( $table, $data, $format = null, $type = 'INSERT' ) {
                if ( ! in_array( strtoupper( $type ), array( 'REPLACE', 'INSERT' ) ) )
                        return false;
                $formats = $format = (array) $format;
                $fields = array_keys( $data );
                $formatted_fields = array();
                foreach ( $fields as $field ) {
                        if ( !empty( $format ) )
                                $form = ( $form = array_shift( $formats ) ) ? $form : $format[0];
                        elseif ( isset( $this->field_types[$field] ) )
                                $form = $this->field_types[$field];
                        else
                                $form = '%s';
                        $formatted_fields[] = $form;
                }
                $sql = "{$type} INTO `$table` (`" . implode( '`,`', $fields ) . "`) VALUES ('" . implode( "','", $formatted_fields ) . "')";
                return $this->query( $this->prepare( $sql, $data ) );
        }

        /**
         * Update a row in the table
         *
         * <code>
         * wpdb::update( 'table', array( 'column' => 'foo', 'field' => 'bar' ), array( 'ID' => 1 ) )
         * wpdb::update( 'table', array( 'column' => 'foo', 'field' => 1337 ), array( 'ID' => 1 ), array( '%s', '%d' ), array( '%d' ) )
         * </code>
         *
         * @since 2.5.0
         * @see wpdb::prepare()
         * @see wpdb::$field_types
         * @see wp_set_wpdb_vars()
         *
         * @param string $table table name
         * @param array $data Data to update (in column => value pairs). Both $data columns and $data values should be "raw" (neither should be SQL escaped).
         * @param array $where A named array of WHERE clauses (in column => value pairs). Multiple clauses will be joined with ANDs. Both $where columns and $where values should be "raw".
         * @param array|string $format Optional. An array of formats to be mapped to each of the values in $data. If string, that format will be used for all of the values in $data.
         *      A format is one of '%d', '%s' (decimal number, string). If omitted, all values in $data will be treated as strings unless otherwise specified in wpdb::$field_types.
         * @param array|string $format_where Optional. An array of formats to be mapped to each of the values in $where. If string, that format will be used for all of the items in $where.  A format is one of '%d', '%s' (decimal number, string).  If omitted, all values in $where will be treated as strings.
         * @return int|false The number of rows updated, or false on error.
         */
        function update( $table, $data, $where, $format = null, $where_format = null ) {
                if ( ! is_array( $data ) || ! is_array( $where ) )
                        return false;

                $formats = $format = (array) $format;
                $bits = $wheres = array();
                foreach ( (array) array_keys( $data ) as $field ) {
                        if ( !empty( $format ) )
                                $form = ( $form = array_shift( $formats ) ) ? $form : $format[0];
                        elseif ( isset($this->field_types[$field]) )
                                $form = $this->field_types[$field];
                        else
                                $form = '%s';
                        $bits[] = "`$field` = {$form}";
                }

                $where_formats = $where_format = (array) $where_format;
                foreach ( (array) array_keys( $where ) as $field ) {
                        if ( !empty( $where_format ) )
                                $form = ( $form = array_shift( $where_formats ) ) ? $form : $where_format[0];
                        elseif ( isset( $this->field_types[$field] ) )
                                $form = $this->field_types[$field];
                        else
                                $form = '%s';
                        $wheres[] = "`$field` = {$form}";
                }

                $sql = "UPDATE `$table` SET " . implode( ', ', $bits ) . ' WHERE ' . implode( ' AND ', $wheres );
                return $this->query( $this->prepare( $sql, array_merge( array_values( $data ), array_values( $where ) ) ) );
        }

        /**
         * Retrieve one variable from the database.
         *
         * Executes a SQL query and returns the value from the SQL result.
         * If the SQL result contains more than one column and/or more than one row, this function returns the value in the column and row specified.
         * If $query is null, this function returns the value in the specified column and row from the previous SQL result.
         *
         * @since 0.71
         *
         * @param string|null $query Optional. SQL query. Defaults to null, use the result from the previous query.
         * @param int $x Optional. Column of value to return.  Indexed from 0.
         * @param int $y Optional. Row of value to return.  Indexed from 0.
         * @return string|null Database query result (as string), or null on failure
         */
        function get_var( $query = null, $x = 0, $y = 0 ) {
                $this->func_call = "\$db->get_var(\"$query\", $x, $y)";
                if ( $query )
                        $this->query( $query );

                // Extract var out of cached results based x,y vals
                if ( !empty( $this->last_result[$y] ) ) {
                        $values = array_values( get_object_vars( $this->last_result[$y] ) );
                }

                // If there is a value return it else return null
                return ( isset( $values[$x] ) && $values[$x] !== '' ) ? $values[$x] : null;
        }

        /**
         * Retrieve one row from the database.
         *
         * Executes a SQL query and returns the row from the SQL result.
         *
         * @since 0.71
         *
         * @param string|null $query SQL query.
         * @param string $output Optional. one of ARRAY_A | ARRAY_N | OBJECT constants. Return an associative array (column => value, ...),
         *      a numerically indexed array (0 => value, ...) or an object ( ->column = value ), respectively.
         * @param int $y Optional. Row to return. Indexed from 0.
         * @return mixed Database query result in format specifed by $output or null on failure
         */
        function get_row( $query = null, $output = OBJECT, $y = 0 ) {
                $this->func_call = "\$db->get_row(\"$query\",$output,$y)";
                if ( $query )
                        $this->query( $query );
                else
                        return null;

                if ( !isset( $this->last_result[$y] ) )
                        return null;

                if ( $output == OBJECT ) {
                        return $this->last_result[$y] ? $this->last_result[$y] : null;
                } elseif ( $output == ARRAY_A ) {
                        return $this->last_result[$y] ? get_object_vars( $this->last_result[$y] ) : null;
                } elseif ( $output == ARRAY_N ) {
                        return $this->last_result[$y] ? array_values( get_object_vars( $this->last_result[$y] ) ) : null;
                } else {
                        $this->print_error(/*WP_I18N_DB_GETROW_ERROR*/" \$db->get_row(string query, output type, int offset) -- Output type must be one of: OBJECT, ARRAY_A, ARRAY_N"/*/WP_I18N_DB_GETROW_ERROR*/);
                }
        }

        /**
         * Retrieve one column from the database.
         *
         * Executes a SQL query and returns the column from the SQL result.
         * If the SQL result contains more than one column, this function returns the column specified.
         * If $query is null, this function returns the specified column from the previous SQL result.
         *
         * @since 0.71
         *
         * @param string|null $query Optional. SQL query. Defaults to previous query.
         * @param int $x Optional. Column to return. Indexed from 0.
         * @return array Database query result. Array indexed from 0 by SQL result row number.
         */
        function get_col( $query = null , $x = 0 ) {
                if ( $query )
                        $this->query( $query );

                $new_array = array();
                // Extract the column values
                for ( $i = 0, $j = count( $this->last_result ); $i < $j; $i++ ) {
                        $new_array[$i] = $this->get_var( null, $x, $i );
                }
                return $new_array;
        }

        /**
         * Retrieve an entire SQL result set from the database (i.e., many rows)
         *
         * Executes a SQL query and returns the entire SQL result.
         *
         * @since 0.71
         *
         * @param string $query SQL query.
         * @param string $output Optional. Any of ARRAY_A | ARRAY_N | OBJECT | OBJECT_K constants. With one of the first three, return an array of rows indexed from 0 by SQL result row number.
         *      Each row is an associative array (column => value, ...), a numerically indexed array (0 => value, ...), or an object. ( ->column = value ), respectively.
         *      With OBJECT_K, return an associative array of row objects keyed by the value of each row's first column's value.  Duplicate keys are discarded.
         * @return mixed Database query results
         */
        function get_results( $query = null, $output = OBJECT ) {
                $this->func_call = "\$db->get_results(\"$query\", $output)";

                if ( $query )
                        $this->query( $query );
                else
                        return null;

                $new_array = array();
                if ( $output == OBJECT ) {
                        // Return an integer-keyed array of row objects
                        return $this->last_result;
                } elseif ( $output == OBJECT_K ) {
                        // Return an array of row objects with keys from column 1
                        // (Duplicates are discarded)
                        foreach ( $this->last_result as $row ) {
                                $key = array_shift( get_object_vars( $row ) );
                                if ( ! isset( $new_array[ $key ] ) )
                                        $new_array[ $key ] = $row;
                        }
                        return $new_array;
                } elseif ( $output == ARRAY_A || $output == ARRAY_N ) {
                        // Return an integer-keyed array of...
                        if ( $this->last_result ) {
                                foreach( (array) $this->last_result as $row ) {
                                        if ( $output == ARRAY_N ) {
                                                // ...integer-keyed row arrays
                                                $new_array[] = array_values( get_object_vars( $row ) );
                                        } else {
                                                // ...column name-keyed row arrays
                                                $new_array[] = get_object_vars( $row );
                                        }
                                }
                        }
                        return $new_array;
                }
                return null;
        }

        /**
         * Retrieve column metadata from the last query.
         *
         * @since 0.71
         *
         * @param string $info_type Optional. Type one of name, table, def, max_length, not_null, primary_key, multiple_key, unique_key, numeric, blob, type, unsigned, zerofill
         * @param int $col_offset Optional. 0: col name. 1: which table the col's in. 2: col's max length. 3: if the col is numeric. 4: col's type
         * @return mixed Column Results
         */
        function get_col_info( $info_type = 'name', $col_offset = -1 ) {
                if ( $this->col_info ) {
                        if ( $col_offset == -1 ) {
                                $i = 0;
                                $new_array = array();
                                foreach( (array) $this->col_info as $col ) {
                                        $new_array[$i] = $col->{$info_type};
                                        $i++;
                                }
                                return $new_array;
                        } else {
                                return $this->col_info[$col_offset]->{$info_type};
                        }
                }
        }

        /**
         * Starts the timer, for debugging purposes.
         *
         * @since 1.5.0
         *
         * @return true
         */
        function timer_start() {
                $mtime            = explode( ' ', microtime() );
                $this->time_start = $mtime[1] + $mtime[0];
                return true;
        }

        /**
         * Stops the debugging timer.
         *
         * @since 1.5.0
         *
         * @return int Total time spent on the query, in milliseconds
         */
        function timer_stop() {
                $mtime      = explode( ' ', microtime() );
                $time_end   = $mtime[1] + $mtime[0];
                $time_total = $time_end - $this->time_start;
                return $time_total;
        }

        /**
         * Wraps errors in a nice header and footer and dies.
         *
         * Will not die if wpdb::$show_errors is true
         *
         * @since 1.5.0
         *
         * @param string $message The Error message
         * @param string $error_code Optional. A Computer readable string to identify the error.
         * @return false|void
         */
        function bail( $message, $error_code = '500' ) {
                if ( !$this->show_errors ) {
                        if ( class_exists( 'WP_Error' ) )
                                $this->error = new WP_Error($error_code, $message);
                        else
                                $this->error = $message;
                        return false;
                }
                wp_die($message);
        }

        /**
         * Whether MySQL database is at least the required minimum version.
         *
         * @since 2.5.0
         * @uses $wp_version
         * @uses $required_mysql_version
         *
         * @return WP_Error
         */
        function check_database_version() {
                global $wp_version, $required_mysql_version;
                // Make sure the server has the required MySQL version
                //if ( version_compare($this->db_version(), $required_mysql_version, '<') )
                        //return new WP_Error('database_version', sprintf( __( '<strong>ERROR</strong>: WordPress %1$s requires MySQL %2$s or higher' ), $wp_version, $required_mysql_version ));
        }

        /**
         * Whether the database supports collation.
         *
         * Called when WordPress is generating the table scheme.
         *
         * @since 2.5.0
         *
         * @return bool True if collation is supported, false if version does not
         */
        function supports_collation() {
                return $this->has_cap( 'collation' );
        }

        /**
         * Determine if a database supports a particular feature
         *
         * @since 2.7
         * @see   wpdb::db_version()
         *
         * @param string $db_cap the feature
         * @return bool
         */
        function has_cap( $db_cap ) {
                $version = $this->db_version();

                switch ( strtolower( $db_cap ) ) {
                        case 'collation' :    // @since 2.5.0
                        case 'group_concat' : // @since 2.7
                        case 'subqueries' :   // @since 2.7
                                return version_compare( $version, '4.1', '>=' );
                };

                return false;
        }

        /**
         * Retrieve the name of the function that called wpdb.
         *
         * Searches up the list of functions until it reaches
         * the one that would most logically had called this method.
         *
         * @since 2.5.0
         *
         * @return string The name of the calling function
         */
        function get_caller() {
                $trace  = array_reverse( debug_backtrace() );
                $caller = array();

                foreach ( $trace as $call ) {
                        if ( isset( $call['class'] ) && __CLASS__ == $call['class'] )
                                continue; // Filter out wpdb calls.
                        $caller[] = isset( $call['class'] ) ? "{$call['class']}->{$call['function']}" : $call['function'];
                }

                return join( ', ', $caller );
        }

        /**
         * The database version number.
         *
         * @return false|string false on failure, version number on success
         */
        function db_version() {
                return '5.0';
        }
}
